Finally the four words! (spoiler)

[Porthos]

Wouldnt be much of a story if V became all powerful, would it?

Yes, but he's going to lose said power very shortly (remeber it has a distinct time limit). Which puts him (potentially) in thrall with a bunch of demons.

Which is always fun.

Besides, there's a running theory that the IFCC will now be able to.... use... V at one of the Gates for their own devices.

Presuming the OotS ever gets to another Gate, that is.